diff --git a/tokio/src/io/util/mod.rs b/tokio/src/io/util/mod.rs
index e06e7e25e47..9ddb7758d4d 100644
--- a/tokio/src/io/util/mod.rs
+++ b/tokio/src/io/util/mod.rs
@@ -77,7 +77,7 @@ cfg_io_util! {
 
 
     // used by `BufReader` and `BufWriter`
-    // https://github.com/rust-lang/rust/blob/master/src/libstd/sys_common/io.rs#L1
+    // https://github.com/rust-lang/rust/blob/master/library/std/src/sys_common/io.rs#L1
     const DEFAULT_BUF_SIZE: usize = 8 * 1024;
 }